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JEE Mains · Maths · STD 11 - 7. binomial theoram

श्रेणी \(2 .{ }^{20} C _{0}+5 .{ }^{20} C _{1}+8 .{ }^{20} C _{2}+11 .{ }^{20} C _{3}+\ldots  +62 .{ }^{20} C _{20}\) का योग बराबर है

  1. A \({2^{23}}\)
  2. B \({2^{26}}\)
  3. C \({2^{24}}\)
  4. D \({2^{25}}\)
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Answer & Solution

Correct Answer

(D) \({2^{25}}\)

Step-by-step Solution

Detailed explanation

\(2 \cdot^{20} \mathrm{C}_{0}+5 \cdot^{20} \mathrm{C}_{1}+8 \cdot^{20} \mathrm{C}_{2}+11 \cdot^{20} \mathrm{C}_{3}+\ldots \ldots+62 \cdot^{20} \mathrm{C}_{20} 2\) \( = \sum\limits_{r = 0}^{20} {(3r + 2){\,^{20}}} {C_r}\)…
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